To be perfectly honest, it's funny to watch the Speculation board after I run transactions on Mt. Gox. Everyone thinks they know what happened and come up with these crazy ideas as to who is manipulating the market. I guess that's why it's here.
The truth is, it's nothing more than trading. We all try to get the best price for our USD/BTC trades. Why it's called manipulation when I trade thousands at a time vs hundreds I don't know. Maybe it's the fact that the market really isn't that big and feels like it's being "controlled" by these large transactions. Should I not trade anymore? If you played with the same volume I do, you'd see that building a "wall" to add support allows you to pick up or sell more coins at a better price. It's really that simple.
So tell me, is it REALLY manipulation?